A sequence is a manner in which a group of objects, a specific task (or activity), or a combination of letters and terms is organized in an order. They were utilized for security-related matters like encryption, as well as computer systems control. Sequences are similar to codes and algorithms.

Bio-neural gel packs were grouped in sequences. Sequence six-theta-nine was the location of a number of gelpacks that malfunctioned while Voyager was traveling through a Mutara classnebula later in the same year. (VOY: "One")